According to this 1UP report, Nippon Ichi's confirmed that the prinnies - the weird penguin things from Disgaea that say "dood" a lot - are to star in their own game.
And not just any game. Prinny: Ore ga Shujinko de Iinsuka? (which translates roughly as, "Prinny: Dood, Are You Sure I Can Be the Hero?"), is an action game where you control a 1000-prinny squadron on a quest to help an extremely angry Etna recover some sweets.
God bless you, you fucking nutters. It's out in Japan on November 20 for PSP. More details through the link.